Lighting device



FIG. 1 is a view showing the general shape of the present design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line disclosure in the views represents portions of the device which form no part of the claimed design. 

CLAIM The ornamental design for a lighting device, as shown and described. 